string = "他问，你知道cba是什么单词的缩写么    ?     "
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项： \n")
    if option=='1':
        string = string.replace(' ','')
        print(string)
    elif option =='2':
        for i in string:
            if i == ',':
                string = string.replace(',','，')
            elif i == '.':
                string = string.replace(',','。')
            elif i == '?':
                string = string.replace(',','？')
            elif i == '?':
                string = string.replace(',','‘')
        string = string